year old female is admitted with confusion. Her daughter tells you that she
had been complaining of backache and had been very thirsty.
patient was known to have cerebrovascular disease and was on aspirin and a
examination you note that she looked unwell ,was pale , her tongue was dry ,
skin turgor was diminished pulse 110 beats per minute regular, BP 110/80 lying
,80 /40 standing .
this patient which one of the following investigation would you arrange next?
Plasma protein electrophoresis
Bone marrow aspiration
Urine for Bence-Jones protein